Sputtering at High RPMs - 3000GT/Stealth International Message Center

94VR4CharNC · 09-08-2008, 08:04 PM

Hey guys, bought my 94 VR4 from a member on this site. Love the car overall and its awesome. Have had it for 4 months now no problem, but last night right when I got off work, noticed a slight hesitation and sputtering when on the gas a little. After getting a little harder on the gas, noticed the sputtering getting louder around the exhaust(sp) area. It only sputters when you are really on it after 3000rpms and/or over 10lb boost. Went home and parked it.

Next morning let it warm up completely incase it was fuel related. After taking it out, still same thing. But this time I tried going through 1st, 2nd and 3rd pretty hard incase something was up with the fuel system (thinking maybe it would clear it up somehow) Well, my luck, it did. After that hard run, it kinda-sorta knocked it back to normal. Still notice a very very slight sputter/hesitation, but overall about back to 98% (atleast feels like it).

Wanted to get some info about this before I take her in. Thanks in advance.

Btw, this is Terry Kerns old VR4 incase some of you are familar with it. Sorry I havent posted sooner to introduce myself. Been busy. Thanks in advance

Angelo

TooFast4Radar · 09-08-2008, 08:53 PM

My first guess would be old plugs and possibly wires. When was the last time they were replaced? If the plugs are old and fowled up it can do that.

VR4-GASM · 09-08-2008, 09:16 PM

Sounds like plug blow-out. Try buying new ones and re-gapping them closer. I would rule out the plug wires for now, since it happens higher in the RPM band.

I doubt it's fuel related.

mywetdream · 09-08-2008, 09:58 PM

to me sounds like your need new plugs...i would get some NGk bcp7es ..which is one stage colder then the stock OEM plugs...my car loved the coppers...

VR4Mit3000GT · 09-09-2008, 07:38 PM

what have you done to my car angelo!!!! haha j/k... ya man i replaced the plugs at 96,500 miles when i sold u the car... put on NGK copper plugs and were gapped and at about .032 i think that's what matt gapped them at anyway.. they r only good for 10,000 miles or so. I'm assuming u didn't raise the boost on it either (hoping anyway unless you got it dyno-tuned). Glad the car is still in good shape overall though... have fun with her!

VR4Mit3000GT · 09-09-2008, 07:42 PM

man.......i miss that car........................................

94VR4CharNC · 09-12-2008, 02:49 PM

yeah, i'm def taking care of her. I have only put 6k on it since I got it, so it couldnt be the plugs, or could it after only 6k? But surprisingly, the problem has fixed itself, back to normal, not sure what happen or why it fixed itself. What could have caused that?
Angelo

overd0s3 · 09-12-2008, 03:05 PM

Sounds like a bad plug gap

94VR4CharNC · 09-15-2008, 06:24 AM

ok, now problem has come and gone again. I guess it is the plugs but that doesnt make sense. Its only had 6k on it since the last plug change and I've been driving it on highway mostly too? Oh well, I guess it will have to be checked out.

Now my next question is, do I change them myself considering I'm new to the VR4, or take it to get new plugs?

andyvr4 · 09-15-2008, 08:53 AM

Quote:

Originally Posted by 94VR4CharNC

Now my next question is, do I change them myself considering I'm new to the VR4, or take it to get new plugs?

You should be fine to changing them yourself assuming that you're decently mechanically inclined and that you follow this guide on stealth316. That guide shows you pretty much every bolt that has to come out and every piece that has to come off.

I'd question rather spark plugs are the problem though because I've never heard of anybody wearing a set of spark plugs out after only 6k miles, even the coppers will usually go 10k.

09-08-2008, 08:04 PM	#1 (permalink)
94VR4CharNC New User - Please be kind Join Date: Jul 2008 Trader Rating: (0)	Sputtering at High RPMs Hey guys, bought my 94 VR4 from a member on this site. Love the car overall and its awesome. Have had it for 4 months now no problem, but last night right when I got off work, noticed a slight hesitation and sputtering when on the gas a little. After getting a little harder on the gas, noticed the sputtering getting louder around the exhaust(sp) area. It only sputters when you are really on it after 3000rpms and/or over 10lb boost. Went home and parked it. Next morning let it warm up completely incase it was fuel related. After taking it out, still same thing. But this time I tried going through 1st, 2nd and 3rd pretty hard incase something was up with the fuel system (thinking maybe it would clear it up somehow) Well, my luck, it did. After that hard run, it kinda-sorta knocked it back to normal. Still notice a very very slight sputter/hesitation, but overall about back to 98% (atleast feels like it). Wanted to get some info about this before I take her in. Thanks in advance. Btw, this is Terry Kerns old VR4 incase some of you are familar with it. Sorry I havent posted sooner to introduce myself. Been busy. Thanks in advance Angelo

09-08-2008, 08:53 PM	#2 (permalink)
TooFast4Radar Moderator Join Date: Aug 2000 Location: Atlanta, GA Drives: The real 94/96/99 Trader Rating: (4)	Re: Sputtering at High RPMs My first guess would be old plugs and possibly wires. When was the last time they were replaced? If the plugs are old and fowled up it can do that. __________________ - 94 R/T Turbo - 93 VR-4 - 94 R/T -

09-08-2008, 09:16 PM	#3 (permalink)
VR4-GASM Verified Seller Join Date: Jul 2005 Location: Lehigh Valley, PA Drives: other ppl's cars Trader Rating: (10)	Re: Sputtering at High RPMs Sounds like plug blow-out. Try buying new ones and re-gapping them closer. I would rule out the plug wires for now, since it happens higher in the RPM band. I doubt it's fuel related. __________________ 1995 3000GT Base BPU+ (10:1 @ 10psi) HKS, Apex-i, GReddy, AEM, K&N, Stillen, ACT, 3SX Performance, Maximal Performance, Ground Zero Performance. 500+ FWHP soon to be in the works

09-08-2008, 09:58 PM	#4 (permalink)
mywetdream Oh SNAP!!! Join Date: Jun 2004 Location: colorado Drives: 94 TT, 69 427 vette Trader Rating: (19)	Re: Sputtering at High RPMs to me sounds like your need new plugs...i would get some NGk bcp7es ..which is one stage colder then the stock OEM plugs...my car loved the coppers... __________________ If you feel I have answered your question..leave me some rep...thanks 1ST place RMG 07 best engine Like the snake the BITE must be felt and not seen, goin super, until then super slow want some!!! 1st car with the Enkei RZ-5 18''x8.5'' 534x306 1994 Dodge Stealth R/T TT~Pearl Yellow

09-09-2008, 07:38 PM	#5 (permalink)
VR4Mit3000GT Forum Member Join Date: Jan 2004 Location: Lincolnton, NC Drives: 1994 3000GT VR-4 Trader Rating: (17)	Re: Sputtering at High RPMs what have you done to my car angelo!!!! haha j/k... ya man i replaced the plugs at 96,500 miles when i sold u the car... put on NGK copper plugs and were gapped and at about .032 i think that's what matt gapped them at anyway.. they r only good for 10,000 miles or so. I'm assuming u didn't raise the boost on it either (hoping anyway unless you got it dyno-tuned). Glad the car is still in good shape overall though... have fun with her! __________________ "FaStEr and FaStEr UnTiL the ThRiLL of SPEED OvErCoMeS the FeAr of DEATH!" 377 awhp, 363 awtq @ 17 psi

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09-09-2008, 07:42 PM	#6 (permalink)
VR4Mit3000GT Forum Member Join Date: Jan 2004 Location: Lincolnton, NC Drives: 1994 3000GT VR-4 Trader Rating: (17)	Re: Sputtering at High RPMs man.......i miss that car........................................

09-12-2008, 02:49 PM	#7 (permalink)
94VR4CharNC New User - Please be kind Join Date: Jul 2008 Trader Rating: (0)	Re: Sputtering at High RPMs yeah, i'm def taking care of her. I have only put 6k on it since I got it, so it couldnt be the plugs, or could it after only 6k? But surprisingly, the problem has fixed itself, back to normal, not sure what happen or why it fixed itself. What could have caused that? Angelo

09-12-2008, 03:05 PM	#8 (permalink)
overd0s3 speeding bastard Join Date: Jun 2006 Location: Bergen County, NJ Drives: 1992 VR4 Trader Rating: (5)	Re: Sputtering at High RPMs Sounds like a bad plug gap __________________ BPU '92 VR-4 Facebook Myspace

09-15-2008, 06:24 AM	#9 (permalink)
94VR4CharNC New User - Please be kind Join Date: Jul 2008 Trader Rating: (0)	Re: Sputtering at High RPMs ok, now problem has come and gone again. I guess it is the plugs but that doesnt make sense. Its only had 6k on it since the last plug change and I've been driving it on highway mostly too? Oh well, I guess it will have to be checked out. Now my next question is, do I change them myself considering I'm new to the VR4, or take it to get new plugs? Last edited by 94VR4CharNC : 09-15-2008 at 06:34 AM.